Lubricating oil compositions

Abstract

Certain polyalkoxylated compounds are combined with alkaline earth metal carbonates dispersed in a hydrocarbon medium to provide lubricating compositions of superior acid neutralizing capability and rust inhibition in internal combustion engines.

I claim: 
     
       1. A lubricating oil composition comprising: a major amount of a hydrocarbon oil of lubricating viscosity;   from about 0.01 to 5 weight percent of at least one oil-soluble acid neutralization accelerating compound of the formula   Y -- (R.sup.1 O).sub.a H        wherein R 1  is an ethylene or propylene radical and a is in the range from 1 to about 12,   and wherein Y is selected from the group consisting of ##SPC2## ##EQU4##   R.sup.2 -- CH.sub.2 O --, ##EQU5##  wherein R.sup.2 is an aliphatic hydrocarbyl radical of molecular weight in the range from about 100 to about 2,000, R.sup.4 is an ethylene radical, d is in the range from 0 to about 70 and e is in the range from 1 to about 12, and sufficient alkaline earth metal carbonate dispersed in said hydrocarbon oil to provide an alkalinity value of from 0.5 to 100 mg.KOH/g.       
     
     
       2. A composition according to claim 1 wherein said alkaline earth metal carbonate is calcium carbonate dispersed in said oil with a phenate or sulfonate lubricating oil dispersant. 
     
     
       3. A composition according to claim 2 wherein said dispersant is a sulfonate dispersant derived from a sulfonic acid of from 25 to 50 carbon atoms. 
     
     
       4. A composition according to claim 2 wherein said dispersant is a phenate derived from alkylated phenol or polymerized alkylated phenols having 2 to 5 phenol groups per molecule and an alkyl group of from 12 to 30 carbon atoms.